November 21, 2016 By Waverley Brownall

5 Impressive Corrosive Resistant Alloys

Corrosion is described as, “A natural but controllable process” by Gretchen Jacobson (Managing Editor of Materials Performance for NACE International.)

It is a naturally occurring problem, the deterioration of materials due to chemical reactions in the surrounding environment.

Corrosive Resistant Alloys

1. 6Mo Austenitic Stainless Steel (UNS S31266)

The metal 6Mo is often referred to as super-austenitic. This type of stainless steel covers grades with high chromium, nickel and molybdenum content. 6Mo is an alloy that was designed specifically for metallurgical stability and resistance against corrosive substances.

Strengths: Seawater and Organic acids

2. Inconel 625 (UNS N06625)

Strengths: Organic acids, alkaline and salts, seawater, sulfuric and nitric acid

3. Hastelloy C-276 (UNS N10276)

Strengths: Organic acids, alkaline and salts, seawater, sulphuric acid, hydrochloric, hydrofluoric and phosphorus acid, chlorine (wet).

4. Titanium (Grade 2 | UNS R50400)

Strengths: Chlorine (wet), uses for strength to weight ratio, alkaline, salts and seawater.

5. Monel 400 or Alloy 400 (UNS N04400)

Strengths: Seawater, salts and hydrofluoric acid.

Learn more…

The Fight Against Corrosion

Corrosion is a problem for many industries, including the Department of Defence, Energy, Oil and Gas production and transfer – including pipelines.

The industry of water and wastewater is also affected; both public and private companies must protect assets against corrosion.

These assets are main parts of the infrastructure for wastewater plants, such as reservoirs, pumping plants and distribution pipelines – even storage.

The materials that are used in order to fight corrosive media is essential for preventing system failures and other hazardous matters.

If you’re interested in the topic of how to prevent corrosion, check out the links below.

Corrosion Concerns In Oil And Gas Production

Inconel 625 Tubing UK Suppliers

Titanium Components Supplied To The Aerospace Industry

Inconel 625 Oxidation Resistance

Inconel 625 oxidation resistance is higher than that of other alloys. It is one of the many reasons that this alloy[…]

Nitric Acid Resistant Materials

Alloy 625 Tubing | 625 Tube Sizes & UK Supply

November 3, 2016 By Waverley Brownall

Tube Fittings Material Selection

Tube fittings material selection can be a tricky process, where cost and availability are at the forefront for many industries.

Quick tip: Charts for aqueous corrosion resistance and material composition can be found on our special metals page.

Tube Fittings Material Selection

All products from our compression Tube fittings (single and double) range are available in special metals.

Other products that can be manufactured include pipe fittings for high or low pressure applications and valves for full flow control of media.

Material	Features	Availability
316 Stainless Steel	Most commonly specified material for a range of environments	Immediate with next day delivery
6MO Stainless Steel	Pitting, crevice corrosion and strength increased from 316	Moderate stocks
Monel 400	Great choice for general seawater application. Popular with pump manufacturers.	Moderate stocks
Duplex SS	A natural step-up from 316 and 6MO	Moderate stocks
Super Duplex SS	Fantastic atmospheric corrosion	Moderate stocks
Incoloy 825	Outstanding resistance in reducing environments, used extensively in chemical processing	Immediate and Moderate
Inconel 625	High strength, excellent corrosion resistance and welding abilities	Deliveries less than 8 weeks
Hastelloy C276	Outstanding corrosion resistance. Almost unmatched in seawater application especially under crevice conditions which would attack 316, 6MO and Monel 400.	Immediate for popular size fittings and Moderate material stock
Titanium	Excellent strength, corrosion resistance and used extensively in the aerospace and automotive industries. Outstanding all-round resistances.	Manufacture-to-order, no more than 6 weeks

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Tube Material Selection

Tubing Material	General Application	Rec. Temp Range*
316 Stainless Steel	High pressure, High Temperature, Generally Corrosive Media	-225C to 605C
Monel 400	Recommended in Sour Gas, Marine and Chemical application	-198C to 425C
Hastelloy C-276	Excellent corrosion resistance to Oxidizing and Reducing Media	-198C to 535C
Titanium	Resistant to Many Natural Environments such as Seawater and Salt solutions	-59C to 315C

Main Considerations When Selection The Right Material

Media (Internal)
Environment (External)
Intended Application and Process
Strengths and possible Weaknesses
Cost effectiveness (Selecting a special metal over 316 stainless steel is often considered a long-term investment. Costs for maintenance are dramatically reduced.)
Availability
Health and Safety Regulations

Corrosive Environments

Possible corrosive environments are a key factor for the durability of tube fittings and pipe fittings. Certain materials will cope better than others when faced with the different types of corrosion.

You will need to find out the effectiveness of the materials you are considering for your fittings against main consideration factors. (Media, environment, strengths, cost effectiveness, availability, safety…)

Corrosion By Acids

*Chart is to be used as a guideline only. Please discuss with us the internal media and external environment for your tube and pipe instrumentation.

Acidic Media	Resistance Material Choices
Sulphuric	6M0 (When the temperature is moderate and concentration is over 65%) Incoloy 825 (Good general resistance) Hastelloy C276 or Inconel 625 (At higher temperature ranges)
Hydrochloric	6M0 (Diluted) Incoloy 825 (Diluted) Inconel 625 (Diluted) Hastelloy C276 (The best choice with aggressive solutions)
Phosphoric	6M0 (Pure phosphoric) Incoloy 825 (Recommended – holds resistance to pure phosphoric at all concentrations and temperatures up to boiling 85%) Hastelloy C276 and Inconel 625 (In the presence of chlorides and fluorides)
Nitric	Incoloy 825 (Resistance to solutions up to boiling 65%) Inconel 625 Titanium

The Main Considerations In Acidic Corrosion Resistance

Concentration of the acid
Working temperatures and aeration
Inclusion of any other medias
The external environment
Dilution methods
Surrounding health and safety considerations

*Information provided in this blog post are to be used for general material selection guidance only. We recommend you speak to one of our specialists for applying your special metal tube, fittings and valves for the working application.

enquiries@waverleybrownall.co.uk

DON’T MISS OUT

With Waverley Brownall’s vast choice of tube fittings, pipe fittings and valves – you will be sure to find what you need with us.

Common thread types include NPTF, BSP, BSPT and BSPP.

In sizes up to 2″ for standard fittings,
materials include all listed in this post.

August 8, 2016 By Waverley Brownall

Corrosion Prevention Material Selection

The issue of corrosion within industries such as oil and gas, chemical processing and marine engineering is extremely important.

To avoid extreme health and safety issues and economic loss, businesses within these industries must be one step ahead of the corrosive media in the working environment.

Solutions for corrosion resistance are available in forms of coatings, but for long-term investment in corrosion resistance, material selection is the number one prevention tool.

Corrosion Prevention Material Selection: The Importance To All Industries

Selecting the correct material to withstand destructive acids, oxygen and waters is the key to avoiding disasters.

This is not only a consideration for economic factors, but industries must prevent disasters on a huge scale that include loss of life, such as the Guadalajara Sewer Explosion. This explosion resulted in the death of 215 people, with 1,500 injured and damage to 1,600 buildings within the surrounding area. You can read more about the explosion in this post on Some Of The Worst Cases Of Corrosion.

Prevention Of Corrosion

Topics covered in this Slideshare include corrosion prevention methods and the considerations regarding material selection for corrosion prevention efficiency.

Prevention of corrosion from Prof. T. K. G. Namboodhiri

Slideshare presentation original works by Professor TKG Namboodhiri,
Consultant in Metallurgy and Corrosion

Corrosion Prevention Material Selection

Materials that are used for their corrosion resistance are often called high-performance alloys, special metals, exotic alloys or exotic metals.

Special Metals (Corrosion-Resistant Metals)

Some metals hold the properties to withstand corrosive environments, alongside issues of pitting, stress-corrosion cracking and more. These metals are more expensive than a standard stainless steel, but they can provide strength within environments with acids, alkaline, salts and seawater.

Not every company can have a qualified metallurgist at hand, luckily, there is plenty of information available from the original creators of certain special metals available online. Such as, Haynes International’s information on the alloy Hastelloy-C276.

Waverley Brownall also offer a free book to help guide you in the selection of our range of special metals for extreme applications. This includes information on the main considerations such as availability, metal composition and corrosion resistance charts for a clear view of a metals resistance in comparison to each other.

Considerations For Metal Selection

Cost of investment (Short term VS. Long term)
Properties of material needed
Application of material
Product of material (Eg. Fittings, Valve)
Design
Material VS. Material comparisons to find the best solution
Technical advice
Industry requirements and regulations

Materials With High Corrosion Resistance

Metals that hold high-corrosion resistant properties include: Incoloy 825, Inconel 625, Hastelloy C-276, Titanium, Super Duplex, Duplex, 6MO. You can find out more about these on our special metals page.

Learn More With A Free Guide

This guide covers everything you need to know for selecting the right corrosion resistant material for our entire range of valves and fittings.

A Guide In The Selection Of Special Metals

*Posted FREE to your address

GET MY GUIDE

Corrosion charts
Applications
Strengths
Alloy properties and Composition

Corrosion Resistant Alloys In Oil And Gas Production

As an approved supplier to Conoco Phillips, BP and Shell, we fully understand the need for correct corrosion prevention material selection within Oil and Gas. Metals within an environment such as this are expected to thrive with external attacks from severe application and heavy usage over a long period of time. This is why we have specialised in manufacturing fittings and valves in special metals to not only cope in these conditions, but to provide the biggest value to engineers around the world.

Other Industries

Chemical
Processing
Purification/Water
Agriculture
Pump and Valve
Petroleum
Renewable Energy
Nuclear

Helpful Links

The Technical Measures Document by HSE.Gov

Corrosion Central by NACE.ORG

Contact Us

enquiries@waverleybrownall.co.uk